"27/10/22 Why is the 40th day of mourning significant? Khosro Kalbasi Isfahani BBC Monitoring reporter Thousands of people took part in protests in Iran yesterday to mark 40 days since the death of Masha Amini. But why is this 40-day anniversary significant? The traditional mourning period in Iranian culture lasts 40 days. Usually, immediate family members wear black during this period and hold a memorial event on the last day. During the years leading to the 1979 Islamic revolution that toppled Shah Mohammad Reza Pahlavi and propelled Islamist theocrats to power, this tradition - along with the burials of protesters - was used by revolutionaries as a rallying point."

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